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Selecting random access channels

a random access and channel technology, applied in the field of radio communication systems, can solve the problems of greater possibility of interference, greater interference possibility, and broadcast channel interference with other traffic channels

Active Publication Date: 2008-03-25
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Embodiment of the present invention can be used to select random access channels to be assigned to user terminals. In one embodiment, the invention includes a base station receiving a signal from a second radio, the received signal containing information about the second radio...

Problems solved by technology

The high power level and the high data rate in combination make it likely that the broadcast channel will interfere with other traffic channels of the radio communications system.
When there are several different base stations transmitting on one or more broadcast channels, the possibility of and amount of interference is greater.

Method used

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Examples

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Embodiment Construction

[0022]Basic Structure

[0023]FIG. 1 shows an example of a wireless communications system or network in which a number of subscriber stations, also referred to as remote terminals or user terminals, (symbolically shown as handsets) 20, 22, 24, are being served by a base station 100 that may be connected to a wide area network (WAN) 56 for providing any required data services and connections external to the immediate wireless system. The present invention relates to wireless communication systems and may be a fixed-access or mobile-access wireless network using spatial division multiple access (SDMA) technology in combination with multiple access systems, such as time division multiple access (TDMA), frequency division multiple access (FDMA) and code division multiple access (CDMA). Multiple access can be combined with frequency division duplexing (FDD) or time division duplexing (TDD). A switching network 58 interfaces with a WAN 56 for providing multi-channel duplex operation with the...

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PUM

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Abstract

Embodiment of the present invention can be used to select random access channels to be assigned to user terminals. In one embodiment, the invention includes a base station receiving a signal from a second radio, the received signal containing information about the second radio, and selecting one or more channels to be used by the second radio for random access to the base station using the information about the second radio. Then the base station sends a signal to the second radio, the sent signal containing information about the selected one or more channels.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 10 / 175,707, filed Jun. 20, 2002, entitled Hopping on Random Access Channels, by Schein, Trott and Chen, and assigned to ArrayComm, Inc., which is a continuation-in-part of U.S. patent application Ser. No. 09 / 675,748, filed Sep. 29, 2000, entitled Radio Communications System with a Minimal Broadcast Channel, by Uhlik, Youssefmir, Trott and Barratt, and assigned to ArrayComm, Inc., the priorities of which are hereby claimed.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention applies to radio communications systems in which several remote terminals communicate voice or data with a base station and, in particular, to such systems in which the base station selects channels to be used by the remote terminals for random access.[0004]2. Description of the Prior Art[0005]Mobile radio communications systems such as cellular voice radio s...

Claims

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Application Information

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IPC IPC(8): H04Q7/00H04B1/713H04B7/06H04B7/08H04W48/12H04W72/04H04W74/08
CPCH04W74/006H04W74/0866H04B1/713H04B7/0617H04B7/086H04W48/08H04W48/12H04W48/16H04W72/02H04W74/0833
Inventor SCHEIN, BRETTCHEN, JOHN S.
Owner APPLE INC
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